Spring-roll for leather-working machines.



E. N. BERGSTROM. SPRENG RGLL FOR LEATHER WORKING MACHINES. APPLICATIONman AUG-B. 1916.

1 1 @AQE Patenwd Jan. 2, 1917.

INVENTOR ATTORN EV EDWIN N. BERGSTROM, OF EAST LYNN, MASSACHUSETTS.

SPRING-ROLL FOR LEATHER-WORKING MACHINES.

Specification of Letters Patent.

Patented at. 2, 1917.

Application filed August 8, 1916. Serial No. 113,805.

To all whom it may concern:

Be it known that I, EDWIN N. BERGSTROM, citizen of the United States,residing at East Lynn, in the county of Essex and State ofMassachusetts, have invented certain new and useful Improvements inSpring-Rolls for Leather-\Vorking 'Machines, of which the following is aspecification.

This invention relates to an improvement in spring rolls, and moreparticularly to devices of this sort such as are applicable for use inconjunction with leather working machines. Heretofore it has beencustomary to use rubber rolls or brass sectional bars upon machinesconstructed to accomplish unhairing and fleshing operations on hides;however, it has been found that where rubber or similar cushioningmaterials are used, the rolls are readily destroyed by the tanning acidsolutions, and on the other hand, where the brass sectional bars areused the free passage of the hides through the machine is somewhatimpeded, therefore it is a purpose of my invention to provide a rollwhich may be mounted to work against the revolving cylinder as usuallyembodied in machines of the type set forth, and is so constructed thatit will give way and have a degree of elasticity to permit working uponskins with lumps caused by pieces of meat adhering to the hides or byforeign matter, to pass the skins between the cylinder and roll Withoutexerting suflicient pressure upon the hide to cause the same to be cutthrough or torn by the cylinder, and which roll will have a betteraction and greater durability than the brass sectional bars.

A further object is to so construct the bearing surface of the roll thatevery portion thereof will be possessed of a certain degree ofelasticity iniependent of the remaining portions and that upon passageover any lumps or foreign matter which may cause depression or springingof the parts, the parts thus moved or swung will be immediately returnedto the normal position to restore the roll to an even and smoothsurface.

Yet another object is to so arrange the roll that upon any part thereofbecoming worn or broken new parts, may be readily substi tuted therefor,and to provide a covering or surface for the roll which will eliminatethe possibility of the various portions of the bearing surface bearingunevenly upon the hides and leaving an impression or marking upon thesame.

With the above and other objects in view, my invention consists incertain novel features of construction and combinations of parts whichwill be hereinafter set forth in connection with the drawings and thenmore particularly pointed out in the claims.

In the drawings, Figure 1 is a view in elevation of a completed rollwith a portion of the surface covering removed to better show themechanical construction of the roll, Fig. 2 is a view in end elevationwith portions shown in transverse section, Fig. 3 is a fragmentarydetail view of one end of the roll with parts shown in longitudinalvertical section.

The main supporting structure of the roll is the shaft 1 which has asleeve-like supporting member 2 mounted thereon to extend throughoutsubstantially the entire length of this shaft 1 and secured in place toleave end extensions or bearings.

The sleeve 2 has collars 4 mounted on each end thereof and these collarsare provided with the externally screw-threaded portions as shown at 5.A plurality of thin spring metal strips 6 are secured by means of screws7 or other suitable fastening means to extend between the collars 4 atopposite ends of the sleeve 2, these spring strips being arranged toextend parallel with the turning axis of the shaft 1. The sleeve 2 isprovided with the bores 8 and the centrally located counter-bores 9which are arranged in pairs radially beneath the mounting of the springstrips 6, and the washers 10 which have cups formed on the outer facesthereof are secured on the inner sides of the spring strips 6, by beingriveted or mounted in any other suitable manner in such relation thatthey are radially alined with the bores and counter-bores 8 and 9. Acompression spring 11 is mounted with one of its ends in thecounter-bore 9 and the remaining end received in the cup of the washer10, it be ing, of course, understood that like springs are provided foreach of the various sets of counter-bores and washers, and thesupplemental compression springs 12 are mounted around the pressuresprings 11 to bear within the bores 8 and against the washers 10.

By mounting the spring strips 6 upon the collar portions 4 and thendisposing the bearing and tension springs 11 and 12 as set forth, aframe-work structure is provided with the spring strips 6 extending asribs between the collar portions 4 an(l longitudinally of the rollstructure. To give a surface structurefor this frame-work, the ringbands 13 are placed upon the spring strips by being fitted endwise overthis frame structure, and these ring bands are placed upon the framestructure until a suflicienl number is provided to form a bearingsurface or bearing structure entirely along the length of the roll, Ringnuts 14 and 1.3 are turned onto the screw-thremled portions of thecollars l to bind against the end ring bands 13 and hold themultiplicity of rings against endwise shifting and lock nuts 16 and l?are screwed onto the collars l to come to hearing against the ring nutsH and 15 and to thus secure the same rigidly against displacement whichwill hold the entire number of ring bands against shifting and will forma completely assembled roll. In the use of the roll as set forth above,the various ring bands will be independently depressed and thedepression of any one band will leave the edges of the adjacent bandsexposed, thus presenting portions which might mark or perhaps score thehides, and to eliminate the possibility of the edges leaving animpression on the hides, I provide a canvas covering or a covering madeof some other such materialas shown at 18. to give a smooth and evensurface to the roll structure and to prevent the possibility of theedges of the ring bands coming in contact with the hides or leaving animpression or marking upon the sam It Will be understood that the rollsin the completed form as above set forth will be fitted in a machine inplace of the usual rubber rolls or will be substituted for the brasssectional bars and the operation of the remaining portions of themachine will not be in any way destroyed or altered. As a hide is passedthrough the machine in contact with the roll, any unevenness orirregularity in the thickness of the hide will by depression of the ringbands against the outwardly extending act-ion exerted by the springstrips 6, and by the bearing springs 11 and the tension springs 12, andthen when the uneven portion has been passed over, the ring bands willbe again restored to the normal relation. From the above it will be seenthat all slight irregularities in the hide will be taken care of by thespring strips 6 and the bearing springs 11, and then when large lumpsorother unevenness is encountered which exerts an extremely depressingeffect against the rin bands, these bands will be sufficiently displacedthat the washers 10 will be brought to bear against the tension springs12 and a greater stiffness of movement will be concomprising a centralhearing be taken up fl sequently imparted to the ring bands. Byarranging the structure as set forth, a device is provided in which anyslight irregularities are readily compensated for and at the same timeprovision is made to permit passage over lumps or other irregularitiesof considerable proportions and it is insured that the hide will at theproper relation to receive the most ellicient treating action, and thatupon passage of the unevenness from beneath the spring roll, thedisplaced parts will be again substantially instantly replaced to insureproper action upon the continued extent of the hide, and further, itwill be noted that the provision of the fabric or other covering at 18insures a smooth bearing surface at all times and a cover surface Whichwill prevent scoring or marking of the hides by the edges of the variousring bands.

While I have herein shown and described only one specific form of thedevice, it will be understood that the shaft, the sleeve and the collarsmight be constructed to constitute a single member, that the ring bandsmight be secured against displacement by means other than that shown andthat still other changes and modifications might be resorted to in theconstruction and arrangement of the parts Without departing from thespirit and scope of my invention, and

all times be held in hence I do not Wish to be limited to the exactdisclosure but rather only to such points as may be set forth in theclaims.

claim:

1. A roll for leather working machinery and supporting structure havingoutstanding flange like portions adjacent to the ends thereof, springstrips mounted longitudinally of said supporting structure to beconnected on the flange like portions and thus provide a resilient framestructure, a plurality of ring bands mounted on said frame structure toform a bearing portion for the roll and to be capable of independentmovement through the resiliency of the spring strips, and a exiblecovering mounted over said ring bands to form a surface bearing portionfor the roll.

2. A roll for leather Working machinery comprising a central bearing andsupporting structure, spring strips mounted longitudinally of saidsupporting structure to provide a resilient frame structure, a pluralityof ring bands mounted on said frame structure to form a bearing portionfor the roll and through the resiliency of the spring strips to becapable of independent movement, and springs mounted between thesupporting structure and the spring strips to give increased flexibilityto the entire structure.

3. A roll for leather Working machinery comprising a central bearing andsupportment, springs mounted between the supportstructure and the springstrips to give mg increased flexibility to the entire structure, and acovering over th 'ing bands to hold the edges thereof from cutting intoand leaving'an impression on the hides being treated. 4. A roll forleather Working machinery comprising a supporting and bearing structure,spring strips mounted longitudinally of said supporting structure toform a resilient frame work, ring bands mounted around the resilientframe work thus formed, means to hold the ring bands againstdisplacement, said supporting structure being provided with bores andcounter-- bores, washers carried by the spring "strips at pointscorresponding to the positioning of the bores and counter-bores, andbearing and compression springs mounted in said counter-bores and boresto. bear against the washers to give added spring action to the springstrips,

5. A roll for leather working machinery comprising a supporting andbearing structure, spring strips mounted longitudinally of saidsupporting structure to form a resilient frame work, ring bands mountedaround the resilient frame work thus formed, means to hold the ringbands against displacement, said supporting structure being providedwith bores and counterbores, washers carried by the spring strips atpoints corresponding to the positioning of the bores and counter-bores,bearing and compression springs mounted in said bores and counter-boresto ers to give added. spring action to the spring strips, and a coveringmounted over the bear against the wash-- ring bands to prevent scoringand marking of the hides being treated through shifting of the ringbands to expose the edges thereof.

In testimony whereof I affix my signature in presence of two witnesses.

EDWIN N. BERGSTROM. Witnesses ERNEST A. HoDGDoN',

, CHAs. G, WOODBRINDGE.

